Pigment rich Gesso primer makes the acid-free, archival clothes beautifully responsive to every brushstroke. Balanced absorbency and tooth provides good adhesion and uncompromised color vitality. The pre-primed weight is 200gsm (5.99oz) and the primed weight is 350gsm (12.34oz). The Traditional range has a .75" and the Deep Edge 1.37" profile. Stretcher bars are made from kiln-dried Fir Paulownia. Wood keys are provided for extra stretching.